Spark-plug



J. IVI. BRINGMAN.

SPARK PLUG. APPLICATION FILED nEc,24, lsIa.

Patented Mar. 16, 1920.

ETRE STATES seaux-PLUG. i

Specification of Letters Patent.

Paten Meer Mair. We, i'i.

Application filed December 24, 1918. Serial No. 268,203.

Be it. known that l, Joiinv M'. liiiNeMAN, a subject of the King otGreat Britain, residing` at Rockyford, in the Province or Alberta andDominion ot Canada, have invented certain new and useful improvementsiii Spark-Plugs, of which the following` is a specilication.

This invention relates to spark plugs, and more particularlyito a sparkplug designed to facilitate the priming of an engine c vlinder inconnection with which the plug is used An object oi the invention is'.to provide a priming spark plug which is relativel),Y simple, inconstruction. and in soconstructed as to lend itseli' to he eas-il)vpacked for transportation or storing. eliminating all parte which might.project heyond the niarvilinum diameter o'tthe shell oi' the plug'. andalso t'o provide a plug' which will prevent leakage ot `ons outwardhvtherethrough durin@` the operation of the engine.

ily/lore specifically. the invention comprehends the provision of aspurl; plug' including the usual porcelain insulator or core partiallyincased wit-hin the inelal shell. which porcelain provided with a recessopening out through its upper end and receiving therein a pair of shellmembers adapted to receive gasolene or analogous volatile Afuel `fromwhich shell ineinher--` the fluid will flow through a tuhe. and about,the central electrode of the plug tor spreading over Jhe head o't` thecentral electrode of the plug 'to facilitate the primingiP ol startingot' an engine with which the spari; plug' is use( to provide a vieldahlemeans within spark plug' construction to normally il'. in a position iopreventtlie passage fluid Jtherethrough which means is ed to lyield uponinward pressure of @per casing section io permit. the flow solene oranalogous fuel out. of the *in the inner head of the electrode. i-ihiec's of the invention will appear e it owing: detailed descrip'ion,taken in conneerion wih the accompanying; drawiorining a part ot thisspecification, and in which drawing:

Figure i is a side elevation o'lE the iinpro'red spark plug.

ylig. 2 is a longitudinal section through ihe spark plug.

Fig. 8 is, a fragmenarv Side elevation or the gasolene receiving andretaining cup.

Fig. e is a vertical section on the line dpiof Fig. a. f

Fig. 5 is, a fragmentary enlarged side elevation of the inner end of'the central electrode.

Fig. is a cross-section through the central elect.rodeand the gasolenefeeding tube Jtaken on the line 6,-6 of Fig. 2, and

Fig. 7 is a cross-section on the line, 7-7

oi' Fig. l. Referring more particularly to the, drawings, l indicatesthe metal shell of tihe spark plug in which `the porcelain or insulatingcore 2 is confined by the usual type of packing nut 3.

The porcelain core 2 is provided with a centrallj,7 disposed here 4 theupper end of which opens out into a recess 5. The recess 5 is formed inthe upper end of the porcelain core 2 and opens out at the upper end or'the said portion.

A tube 6 extends through the bore l and receives longitudinallytherethrough the stern 7 of the central electrode of the plug. The.upper end of the stem? is enlarged and screw threaded as shown at 8,having its upper end 9 flattened as shown in Fig. and threaded into theipple 10 formed upon J@he upper end of th section "1l of the g'asoleneretainer or shell member. The gasolene retainer or shell membercomprises the upper section l1 and the lower section 12 which lattersection is positioned wholly within the, recess 5 and has its upper endseated in or telescopically mounted in the lower end of the upper shell11. The lower end of the shell 12 is threaded to the upper end orq thesleeve 6 as shown at 13. The shell V12 is provided with a pair ofdiametri cally opposed longitudinally extending; slots le, the upperends oit which 'open out at the upper end of the shell while the lowerends terminate in transverse openingsl.

' Luge i6 are formed upon the lower edge'of the upper shell 11 andengage in the slot- 14 for `guiding telescopingr movement of the section11 with respect to the section '12 while a slight rotation of the shell1l when the lug; reaches the lower end ot' the s1ot 14, moving the luginto the transverse opening l5 will loclc the shell 1l in its depressed'or inner position, consequently moving the head 18 of the centralelectrode outwardly,

unseating the. valve or closure ortion l9 'thereot to allow gasolene tohow from with in 'ehe shell lfthrougn ehe tube 6 and about naar-:sar

section thereof, said central electrode connected to said depressiblesection whereby the enlarged end Will be partially unseated upondepression of'the depressible section.

5. in a spark plug, the combination, of an insulating core provided witha central bore and a recess in its upper end having communication withsaid bore, a gasolene retainer Within said recess and havingcommunication with the interior of the bore to permit the passage ofgasolene from the retainer through the insulating core, the lower endoi' said electrode being enlarged for snug fitting in said bore to forma closure therefor, said enlarged end provided with recesses in itsVface for portion of its length, to permit the escape of fluidtherethrough when the enlarged end is partially unseated, and a springcoiled about said central electrode and normally holding the enlargedend in a closing position topi-event the passage or fluid through thecore.i said gasolene retainer comprising a pair of sect-ions slid-y ablyconnected to permit the depression of one. section thereof, said centralelectrode connected to said depressible sectionwhereby the enlarged endwill be partially unseated upon depression of the depressible sectionand means tor holding the depressible section in a depressed position.

6. in a spark plug, the combination, of an insulating core provided witha central bore and with a recess in its upper end having communicationwith the bore, a gasolene retainer within said recess and comprisingup'- per and lower shell members slidably connected to permit depressionot' the upper shell member, means connected to said upper shell memberto permit the flow of gasolene through the. insulating core when theupper shell member is depressed.

'l'. ln a spark plug, the combination, of an insulating core providedwith a central bore and with a recess in its upper end havingcommunication with the bore, a gasolene retainer within said recess andcomprising upper and lower shell members said uppermember slidablysupported to permit depression thereotmcans connected to said uppershell member to permit the flow of gasolene through the insulating corewhen the upper shell member is depressed, and means for normally urgingsaid depressible means outwardly vto prevent the passage oic fluid ithrough the insulating` core.

R. in a spark plug, the combination, of an .vent the passage insulatingcore ,provided with a central bore and with a 'recess in its upper endharing communication with said bore, a gasolene retainer in said recessand comprising an upper and a lower shell member mounted topermltdepression of the upper shell mem-,

ber, a central electrode extending through said gasolene retainer andbore and connected to said upper shell, 'the lower end of said electrodebeing enlarged for snug fitting in said bore to form a closure thereforand preof gasolene through the bore.

9. In a spark pluggthe combination, of an insulating core provided witha central bore and with a recess in its upper end having communicationwith said bore, a gasolene retainer in said recess and comprising anupper and aflower shell member mounted to permit depression of the uppershell member, a central electrode extending through said gasoleneretainer and bore vand connected to said upper shell, the lower endofsaid electrode being'enlarged for snug tting in said bore to form aclosure therefor and prevent the passage of gasolene through the bore,the enlarged end of said electrode provided with longitudinallyextending recesses in apart of its length adapted to permit the passageof gasolene therethrough when the enlarged end is partially unseated.

10. In a spark plug, the combination, of an insulating core lprovidedwith a-central bore and with a recess in its upper end 'havingcommunication with said bore, a gasolene retainer in said recess andcomprising an upper and a lower shell member mounted to permitdepression oi' the upper shell member, a central electrode extendingthrough said gasolene retainer and bore and connected to said uppershell,'the lower end of said electrode being enlarged for snug fittingin said bore to form a closure therefor and prevent the passage ofgasolene through the bore, the enlarged end of said electrode providedWith longitudinally extending recesses in a part of its length adaptedto permit the. passage of gasolene therethrough when the enlarged end ispartially unseated, an inverted substantially conical shaped cupconnected to the upper end of said upper shell, the upper end of' saidelectrode being cut away to permit the passage of gasolene from said cupinto the retainer.

JOHN MARTIN BRINGMAN.

